Rock-drill



. UNITEDISTATES. PATENT, OFFICE.

WILLIAM Arsiurrn, or DENVER,` coLoRADdAssrGNoRro VTHE DENVER RooK DRILL MANEACTURING COMPANY, WARE.

or DENVER,

COLORADO, A CQRPORATION DELA.-

ROCK-DRILL.

specification of Lettersratent. A .Patelltedgune 29,1920` original application mea December 1s, 1916, serial No. 137,363. Divided ami this application mea J'uiy 23,.'19'17. lserial No. 182,310. l

T0 all 'whom t may concern 1 l -Be it known that I, VILLIVAM A. SMITH, a .citizen of the United States, residing at Denver, in the county of Denver andState of Colorado, have inventedcertain new and useful Improvements in `Rock Drills, of which the following, is a specification. f The present invention relates-torfluid operated tools, preferably of the hammer type,

and the primary object is to'provide novel means of. an ei'lective l character lfor .controlling the supply of motive fluid to the tool,l

and also for, delivering lubricant thereto.

This application is a division of application, Serial No. 137,363, filedY December 16,l

. 1916, now Patent 1,293,960, dated February VIn the accompanying drawings I Figure 1 is a plan view partially )in section of one embodiment of the invention.

Fig. .2 is a longitudinal sectionalview therethrough.

Similar reference numerals designate corresponding parts in allftheigures of the drawings. ,v ;V j.

In the embodiment illustratedr the motor consists of a barrel or cylinder member 3 within which reciprocates a hammer piston 4 having an extension 5 of less diameter than the piston proper. Motive fluid is supplied to the piston chamber Vby a passageway' 6 having at its front end lateral branches 7, which communicate with the interior of the cylinder on opposite sides of the `piston and with longitudinal channels 8 cut in said piston, these channels terminating short of the ends of the piston as will be clear by reference to Fig. 1.

Formed on opposite sides of the cylinder member adjacent to the front and rear ends thereof, are recesses 9 with which the ends of the channel alternately communicate accordingly as the piston reciprocates. It will thus be seen that motive fluid entering the supply passage 6 will pass through the branches 7 and be alternately delivered through the channels 8 and recesses 9 to the front and rear ends of the piston to reciprocate said piston. The exhaust takes place through a passageway 10 formed in one side of the cylinder member and having ports 11 that are alternately covered and uncovered by the ends of the piston upon its reciprocation. The passageway 10 preferably delivers lthe exhaustV forwardly and therefore away from the operator.` f

. For the purpose of supplying motive fluid o the passageway 6, the following mechanism is employed. The cylinder member 3 is provided with a rearhead 12 which is chambered as shown at`l3, saidy chamber con- Y 19. Thishandle, vas shownin Fig. 1, `has oppositely outstanding ears l20 slidable upon the rearwardly.. projecting ends 21 of side bolts 22 that connect theI rearhead 12 with the front head 23V of the motor, andy thus clamp said heads upon the barrel. The

portions 21' of thebolt's, it will be observed,

project beyond the parts which engage the rear head for the purpose of providing slidkinof mountings for the handle.

he handle is provided with a lateral inlet passageway 24 to which may be coupled the usual hose line, and .this passageway is in communication with the bore 25 of the neck 1S. The said neck is provided with a lateral port 26 that is movable into communication withrthe passageway 14fwhen the handle is moved toward the motor, said port being closed whenthe handle is in its outermost position. It will thus be seen -that when the handle is'pushed forwardly the port 26 will be brought into communication with the passageway 14, so that motive. fluid supplied to the passageway will pass into the motor to operate the same. or outward movement of the handle is secured by the pressure of fluid which can enter the socket 17 of the extension 15.

The lubricant reservoir 13 can be supplied with lubricant through a port normally closed by a removable plug 27, and said lubricant reservoir furthermore has an outlet port 28 formed in the inner circular wall through which the neck 18 passes. The neck is provided with a lubricant receiving The rearward clear that lubricant received into the pocket when the handle is in its outer position will, 14 when be delivered into the passageway the handle is pushed inwardly, and this lubricant will be carried by the motive fluid.

to the motor.

From the foregoing, it is thought that the construction, operation and many advantages offthe herein described invention will be apparent to those skilled in the art, with-y outi'urther description, and it will beunderstoodthatvarious changes in the size, shape, proportion and minor details of construction maybe resortedto without departing :from the spiritor scope of the invention.

Having thusA fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

l. The combination with a yfluid operated motorincluding a cylinder member and a piston, saidl piston having its rear portion hollow, and said cylinder'member including a rear head member provided with a forward extension received inthe hollow of the piston and provided with a socket, of a handle having al neck slidable in the socket, and means controlled by thehandle for supplyingV motive fluid to the motor.

2. The combination with a fluid operated motor including a cylinder member having a back-head, and a pistonoperating in the cylinder member, said piston having its rear vhaving a` port in one side movable. into and out of communication with the passageway, and 'means for supplying lmotive 4fluid Ito.' the bore of th'efneck, said motive fluid entering the inner end of the socket and operating` against the innery end `of= the neck.

3; The combination withaliuid 1actuated motor including -a xbarrel havingy a '-rea-rhead,A

said rearheadfbeing providedwith an interhal forwardly projecting sock'eted` eX- tensionand a passageway for conducting motive fluid tothe motor, oVa-liandlehaw ing means yfor attaching a motivevfl'uid :supply tube thereto, said handle having a forwardly projecting tubular; neckfcommunicat ing with said supply connecting means, the

neck being slidable in the extension and having alateralp'ort'movable'into and out of communication withlthe passageway, side bolts connecting the rear 'head to the barreland projecting 'beyond the vsaid rearf head,

and outwardly extending ears carried by the handle and slidableuponthe projecting portions ofthe side bolts.l l j In testimony whereof; I vaflix myA signature ture in the presence oftwo-witnesses. Y WLLIAM Af. SMIT-HZ `VVitnessesvv j J L YF; CHAMBERS, J. P. FLYNN.

provided with f a rear-- 

